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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

If the router restarted for any reason Network manager won't enable eth0 automatically after the router is up again. I have to click on the Network manager icon and enable eth0 manually each time that happens. Is there a way to fix this??

Not that I've ever found.. network-manager is junk imho.. it doesn't play well with anything and only manages the basics.
wicd is more functional, but that's just my opinion.

Auto reconnect is a simple check box in wicd, I helped someone with this exact same issue a week or so ago, and he was ecstatic about it working exactly like he wanted. After switching to wicd, his router rebooted and the NIC reconnected automatically

It's not like you couldn't switch back easy enough if it doesn't work out for you.

I have removed Network manager and stucked with no connection for half an hour. LoL
I used dhcpclient to get it back. I tried manually setting it up using ifconfig and route but failed. Now I will install wicd. Hope it goes well.

Sorry, I have checked the links and searched a bit as well. I still have a problem. One of the links said to log out and log back in and it should be started but didn't happen. When i try to open the wcid-client from a terminal that's what I get: